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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52deab48ca75ec3afb45a1e7a82dcd2ad4fba4643d155127178e2a10bcce5eae' 
  AND token = 'ZyMUz329lCwJE/FMDD2SOHCbFiOjql89Tiumx8nDYhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}